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Debt (Schedule of Deferred Financing Costs) (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Bank credit facilities [Member]
Jun. 30, 2012
Convertible notes [Member]
Jun. 30, 2012
ACP project [Member]
Jun. 30, 2012
Deferred financing costs [Member]
Deferred Finance Costs, Beginning Balance $ 11.2 $ 12.2 $ 2.4 $ 5.5 $ 6.7 $ 12.2
Deferred financing costs, additions     9.2      
Deferred financing costs, reductions     (5.0) (0.9) (0.1) (1.0)
Deferred Finance Costs, End Balance $ 11.2 $ 12.2 $ 6.6 $ 4.6 $ 6.6 $ 11.2